91 LeSabre car starts only when cool
vems
10-26-2004, 03:32 PM
Here is the problem.
The car starts fine if it has been sitting for a day or two. It will run fine, however after you shut the car off, it won't start up until maybe 2 or 3 hours later once it has had time to cool down. And just recently it has been dieing - once while it was being driven and 2 other times while it is idling in park.
At first I was getting code 41, so I replaced the camshaft and crankshaft sensors and still got the code. Then replaced the camshaft magnet and then everything read fine. I thought that would fix the problem, but it didn't. I am getting no codes from the computer so I changed the ingnition module and the coil pack. Didn't fix the problem. I checked and there is spark. It seems like there is plenty of fuel pressure as gas squirts out the valve on fuel rail, but I didn't check the actual pressure.
I was wondering if anyone had any advice for me. I'm out of ideas.
Thanks in advance.
The car starts fine if it has been sitting for a day or two. It will run fine, however after you shut the car off, it won't start up until maybe 2 or 3 hours later once it has had time to cool down. And just recently it has been dieing - once while it was being driven and 2 other times while it is idling in park.
At first I was getting code 41, so I replaced the camshaft and crankshaft sensors and still got the code. Then replaced the camshaft magnet and then everything read fine. I thought that would fix the problem, but it didn't. I am getting no codes from the computer so I changed the ingnition module and the coil pack. Didn't fix the problem. I checked and there is spark. It seems like there is plenty of fuel pressure as gas squirts out the valve on fuel rail, but I didn't check the actual pressure.
I was wondering if anyone had any advice for me. I'm out of ideas.
Thanks in advance.
sierrap615
10-27-2004, 01:48 AM
just general thoughts...
check the wires going to the PCM from the ignintion module. besure the gap for the sensors isn't to wide
check the wires going to the PCM from the ignintion module. besure the gap for the sensors isn't to wide
rustbucket
10-27-2004, 08:48 AM
You can hook up a small 12 volt lamp and plug it into one of the injector connectors and crank it. If it flashes, it proves the PCM/ECM is pulsing the injectors.
vems
10-29-2004, 06:25 PM
I thought the cam and crank sensors were both replaced however after I received code 41, only the cam sensor was replaced (which didn't fix the problem. So I replaced the cam magnet and that eliminated the code 41 problem. At this point, the car would still only start when it was cool and the computer was not showing any codes.
After reading some posts in this forum, I tried the water on the crankshaft sensor trick. We sprayed a little water and nothing. We tried a couple of other things and still wouldn't start. Finally we got the hose out and doused the sensor and it fired right up. Waited for the car to die and not start again and then we sprayed it again and it started right up.
So, tomorrow I'm going to change that sensor. Thanks to everyone in this forum as I would of never figured this problem out. (Why wouldn't the computer give you a code for bad crankshaft sensor as it does for every other sensor on the car?)
After reading some posts in this forum, I tried the water on the crankshaft sensor trick. We sprayed a little water and nothing. We tried a couple of other things and still wouldn't start. Finally we got the hose out and doused the sensor and it fired right up. Waited for the car to die and not start again and then we sprayed it again and it started right up.
So, tomorrow I'm going to change that sensor. Thanks to everyone in this forum as I would of never figured this problem out. (Why wouldn't the computer give you a code for bad crankshaft sensor as it does for every other sensor on the car?)
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